KR102540052B1 - An internet of things network system based on blockchain and the management method thereof - Google Patents

Abstract

The present invention configures a blockchain-based IoT network as an open distributed network, stores policies for data collected when collecting data from IoT devices in the blockchain network, and blocks when querying the data. A blockchain-based Internet of Things network system and its management method for checking and then querying policies stored in a chain network, comprising: a plurality of IoT networks composed of IoT devices and network servers; cloud storage to store data; And, a blockchain network comprising the network server as a blockchain node, wherein the network server stores data collected from IoT devices belonging to its own IoT network in the cloud storage, and stores address and data for the data. Prepare a configuration for recording policy and data transaction information in the blockchain network.
By using the system and method as described above, by recording policies for collected data in the blockchain network, even if the IoT network is configured as an open distributed network, flexible data sharing is possible in each node, and the vulnerability problem caused by data manipulation is solved. can be solved

Description

An internet of things network system based on blockchain and the management method thereof }

The present invention configures a blockchain-based IoT network as an open distributed network, stores policies for data collected when collecting data from IoT devices in the blockchain network, and blocks when querying the data. It relates to a blockchain-based Internet of Things network system that checks and then inquires policies stored in a chain network and its management method.

In general, the blockchain ecosystem is developing rapidly as dozens of blockchain platforms such as Ethereum, Eos, and Polkadot have been developed and put on the market since Bitcoin [Non-Patent Document 1]. ]. The development of blockchain platforms with various purposes has resulted in a large number of platform-specific coins and tokens. However, most of the blockchains and digital assets developed in this way are independent and isolated, and are used only within the developed blockchain platform. A typical example is that smart contracts and Dapps, which are the main features of the Ethereum platform, cannot be used in Bitcoin.

This problem, that is, the problem of interoperability between blockchains, can be solved in various ways, such as an inter-chain project that plays a role in connecting each blockchain platform, or a side-chain project that can add functions by connecting other sub-chains to the corresponding blockchain. can move on A blockchain that has solved the interoperability problem can get out of isolation and gain various benefits through exchanges with other blockchains. For example, it has the advantage of being able to solve the movement of digital assets between different chains, the function of calling contracts in chains without smart contract functions, security entrustment, and scalability problems [Non-Patent Document 2]. As a representative example, Rootstock is a side chain project that connects its own chain to Bitcoin, enabling Bitcoin to call Ethereum's smart contract. In addition, it enables the movement of assets between each other, solves the problems of Bitcoin, such as slow transaction processing speed and low versatility, with Rootstock's fast TPS, and merge-mining and merge-mining by miners. It is a platform that secures security and stability, which are the advantages of bitcoin, by compensating a certain amount of sidechain coins when mining bitcoin [Non-Patent Document 3-4]. Like the Internet, where computers around the world are connected and networks are formed, the solution to the interoperability problem of these blockchains can develop into the establishment of a complete blockchain ecosystem by forming a network connecting each blockchain project.

On the other hand, the technologies that are currently attracting the most attention in the 4th industrial revolution will be AI (Artificial Intelligence) and blockchain. The two technologies, artificial intelligence and blockchain, continue to innovate in many fields, such as services, technology, manufacturing, and finance. For example, in the global AI survey announced by McKinsey, about 48% of companies have introduced and operated artificial intelligence AI in one or more functional organizations, and the Asia-Pacific Economic Cooperation (APEC) artificial intelligence report found that AI policy It implied that the importance of AI would increase in the future, such as raising the importance and strengthening AI cooperation among member countries. In addition, Gartner, an IT research institution, is selecting blockchain as a technology that will reach its peak in the future, showing wider use cases and influence than before, out of the initial state of technology [Non-Patent Documents 5-6].

As such, each technology has great value as a technology that leads the 4th industrial revolution, but innovation is taking place to find and combine blockchain and artificial intelligence technologies. This is because it is expected that a synergistic effect will occur that complements the limitations of the two technologies through combination and maximizes the advantages. In the case of artificial intelligence based on machine learning, decisions are made based on countless information and many variables, and if unverified information exists in the information, artificial intelligence may make a wrong decision. In this case, by introducing blockchain into artificial intelligence, the decision-making process of artificial intelligence is recorded in parts using block-chain time stamps, etc. to help humans understand and track AI decisions, which is called Deep Learning ) will solve the black box problem. In addition, through the process of sharing and verifying fragmented information among participants using a decentralized blockchain, it will be possible to provide reliability and integrity to information learned by artificial intelligence [Non-Patent Documents 7-9].

Even in the case of blockchain, the problem of finding out individual identity information through information recorded on the blockchain between transactions was partially solved through privacy coins such as Monero and Zcash, but the problem of personal information in remittance was partially solved, but the smart contract process Data privacy in is not completely protected. It is possible to implement a function to prevent the spread of damage, such as preventing hackers who attack the vulnerability in advance or preventing damage from spreading to other blocks through artificial intelligence algorithms. Problems of the blockchain consensus algorithm mechanism, such as high energy consumption and the monopoly of a small number of participants in proof of stake, can be improved by improving the consensus mechanism through artificial intelligence to improve efficiency, and as the information stored on the chain increases, bloated blocks are organized. It will be possible to apply a distributed algorithm between block nodes using artificial intelligence, and it will be possible to implement fast TPS (Transaction per Second) by minimizing transaction verification [Non-Patent Documents 9-12].

Cortex (CTXC), an example of combining artificial intelligence and blockchain, is the first programming cryptocurrency platform that combines blockchain and artificial intelligence. Cortex implements artificial intelligence models into smart contracts, enabling the use of artificial intelligence inference consensus functions. It is also possible for users to directly implement artificial intelligence Dapp through the compatibility of artificial intelligence models in the platform itself. In the existing Ethereum, smart contracts were processed through the central processing unit, but it was difficult to implement an artificial intelligence model with complex codes due to the CPU's computing power. Therefore, Cortex made it possible to implement an artificial intelligence model by using a GPU (Graphics Processing Unit) and a programmable semiconductor, FPGA (Field Programmable Gate Array) in a full node. Cortex plans to apply an information protection mechanism using zero-knowledge proof, homomorphic encryption, etc. to model data privacy and intellectual property on applications such as machine learning in the future [Non-Patent Document 13 ].

Minds Lab, an artificial intelligence company, is collaborating with DeepBrain Chain, a blockchain AI company, with the goal of product development cooperation and technology development. MINDsLab, which mainly develops customer support services such as manuscript recording service Maum AI and artificial intelligence financial secretary HAI Banking, increases data security and efficiency in the AI learning process through decentralization and personalization through the introduction of blockchain. .

As in the cases above, the combination of blockchain and artificial intelligence will provide more advanced services, help emerge new business and technology models, and accelerate innovation.

In addition, Figure 1 explains the change process of technology convergence trends, and the development of the new digital era in the existing social, mobile, and cloud convergence is that AI, blockchain, and Internet of Things (IoT) technologies are the base of their respective areas. As it expands, convergence models such as IoT owns data, blockchain manages, and services are provided by AI will continue to appear [Non-Patent Document 14].

Kim, S., Kwon, Y., & Cho, S. (2018). A survey of scalability solutions on blockchain. 2018 International Conference on Information and Communication Technology Convergence (ICTC). doi:10.1109/ictc.2018.8539529 Singh, A., Click, K., Parizi, R. M., Zhang, Q., Dehghantanha, A., & Choo, K. R. (2020). Sidechain technologies in blockchain networks: An examination and state-of-the-art review. Journal of Network and Computer Applications, 149, 102471. doi:10.1016/j.jnca.2019.102471 Lerner, S. D. (2015). RSK. Ganesh, N.G. (2020). Identification of blockchain-enabled opportunities and their business values: Interoperability of blockchain. Blockchain Technology and Applications, 159-184. doi:10.1201/9781003081487-9 From, W. W. C. The State of AI in 2020. Samanta, S., Mohanta, B. K., Patnaik, D., & Patnaik, S. (2021). Introduction to blockchain evolution, architecture and application with use cases. Blockchain Technology and Innovations in Business Processes, 1-16. doi:10.1007/978-981-33-6470-7_1 Saigal, P. (2020). Merger of artificial intelligence and blockchain. Blockchain Technology and Applications, 139-158. doi:10.1201/9781003081487-8 Corea, F. (2018). The convergence of AI and blockchain. Springer Briefs in Complexity, 19-26. doi:10.1007/978-3-319-77252-3_4 Yang, H. T. (2020). Artificial Intelligence and Blockchain Convergence Trend and Policy Improvement Plan. Informatization Policy, 27(2), 3-19. Karame, G., & Capkun, S. (2018). Blockchain security and privacy. IEEE Security & Privacy, 16(4), 11-12. doi:10.1109/msp.2018.3111241 Vedula, R. M., Bhadoria, R. S., & Dixit, M. (2021). Integrating blockchain with AI. Multidisciplinary Functions of Blockchain Technology in AI and IoT Applications, 1-25. doi:10.4018/978-1-7998-5876-8.ch001 Gupta, J., Singh, I., & Arjun, K. P. (2021). Artificial intelligence for blockchain i. Blockchain, Internet of Things, and Artificial Intelligence, 109-140. doi:10.1201/9780429352898-7 Chen, Z., Wang, W., Yan, X., & Tian, J. (2018). C ortex-AI on blockchain. Cortex Labs Pte. Ltd., Sin Gapore, Tech. Rep. C, 201803307, 2018. Kiruthika, M., & Ponnuswamy, P. P. (2021). Fusion of IOT, blockchain and artificial intelligence for developing Smart Cities. Blockchain, Internet of Things, and Artificial Intelligence, 155-177. doi:10.1201/9780429352898-9

An object of the present invention is to solve the problems described above, to configure a blockchain-based IoT network as an open distributed network, and to implement a policy for data collected when data is collected from an Internet of Things (IoT) device. To provide a blockchain-based Internet of Things network system and its management method, which is stored in a blockchain network and retrieved after checking the policy stored in the blockchain network when querying the data.

In order to achieve the above object, the present invention relates to a blockchain-based Internet of Things network system, comprising: a plurality of IoT networks composed of IoT devices and network servers; cloud storage to store data; And, a blockchain network comprising the network server as a blockchain node, wherein the network server stores data collected from IoT devices belonging to its own IoT network in the cloud storage, and stores address and data for the data. It is characterized by recording policy and data transaction information in the blockchain network.

In addition, in the blockchain-based IoT network system of the present invention, the cloud storage is formed in an overlay network structure based on a network composed of the network servers.

In addition, in the present invention, in a blockchain-based Internet of Things network system, the network server has its own blockchain ledger to serve as a blockchain node, and the blockchain ledger includes data storage addresses, data policies, data It is characterized by organizing and holding blocks that record data transactions as a chain, and holding the blockchain ledger in synchronization with other network servers.

In addition, in the present invention, in the blockchain-based Internet of Things network system, when the network server collects and stores data from the IoT device or retrieves data, the data storage address, data access authority, and storage/retrieval transaction information are converted into blocks. It is characterized in that it is configured, added to its own blockchain ledger, and propagates the added block information to other network servers.

In addition, in the present invention, in the blockchain-based Internet of Things network system, the network server can access the blockchain network by accessing its own blockchain ledger, query its own blockchain ledger, or access its own blockchain ledger. By adding and updating a block, it is characterized by accessing the blockchain network to inquire the blockchain or to update by adding a block to the blockchain.

In addition, the present invention relates to a blockchain-based Internet of Things network system, comprising: (a1) transmitting data from the IoT device to a network server of an IoT network to which it belongs; (a2) the network server accessing the blockchain network and requesting whether or not to allow storage of corresponding data; (a3) checking the data policy of the right to store the corresponding data in the blockchain network; (a4) if the storage of the corresponding data is approved, storing the corresponding data in the cloud storage by the network server; (a5) transmitting and storing corresponding data to the network server according to the overlay network structure; (a6) transmitting the storage address of corresponding data to the network server in the cloud storage; and (a7) storing the transaction for the storage of corresponding data in the network server in the blockchain network.

In addition, the present invention relates to a blockchain-based Internet of Things network system, comprising: (b1) the network server receiving a request for data inquiry; (b2) requesting, by the network server, an investigation into the right to search for corresponding data to the blockchain network; (b3) in the block chain network, checking the inquiry authority of the corresponding data and the storage address of the corresponding data; (b4) transmitting, in the network server, a storage address of the corresponding data to the cloud storage when the inquiry of the corresponding data is approved; (b5) inquiring the corresponding data using the storage address of the corresponding data in the cloud storage; (b6) transmitting the searched data from the cloud storage to the network server; (b7) storing the transaction for inquiry details in the blockchain network in the network server; and (b8) returning the requested data from the network server to the provider.

In addition, in the present invention, in the blockchain-based IoT network system, the IoT network is characterized in that it is composed of a plurality of IoT devices and one network server.

In addition, the present invention is characterized in that in the blockchain-based IoT network system, the IoT network communicates with each other according to the LPWA (Low Power Wide Area) standard.

In addition, the present invention relates to a data management method of a blockchain-based Internet of Things network system including a plurality of IoT networks composed of IoT devices and network servers, and (c1) a network server of an IoT network to which the IoT device belongs. Transmitting data to; (c2) the network server accessing the blockchain network and requesting whether or not to allow storage of the corresponding data; (c3) checking the data policy of the right to store the corresponding data in the blockchain network; (c4) if the storage of the data is approved, storing the corresponding data in a cloud storage in the network server; (c5) transmitting the storage address of corresponding data to the network server in the cloud storage; and (a6) storing the transaction for the storage of corresponding data in the network server in the blockchain network.

In addition, the present invention provides a data management method of a blockchain-based IoT network system, the method comprising: (d1) receiving a request for data inquiry by the network server; (d2) requesting, by the network server, an investigation into the right to search for corresponding data to the blockchain network; (d3) in the blockchain network, checking the inquiry authority of the corresponding data and the storage address of the corresponding data; (d4) transmitting, in the network server, a storage address of the corresponding data to the cloud storage when the inquiry of the corresponding data is approved; (d5) retrieving the corresponding data using the storage address of the corresponding data in the cloud storage; (d6) transmitting the searched data from the cloud storage to the network server; (d7) storing the transaction for inquiry details in the blockchain network in the network server; and (d8) returning the requested data from the network server to the provider.

In addition, in the data management method of the blockchain-based Internet of Things network system of the present invention, the blockchain network is characterized in that all network servers are configured as blockchain nodes, respectively.

In addition, in the data management method of the blockchain-based IoT network system of the present invention, the cloud storage is formed in an overlay network structure based on a network composed of all network servers.

As described above, according to the blockchain-based Internet of Things network system and management method thereof according to the present invention, even if the IoT network is configured as an open distributed network by recording policies for collected data in the blockchain network, each node Flexible data sharing is possible, and the effect of solving the vulnerability problem caused by data manipulation is obtained.

In addition, according to the blockchain-based Internet of Things network system and management method thereof according to the present invention, the IoT network is configured as an open distributed network, but transaction data is shared by the blockchain network, so that even if a failure occurs in one part, data is distributed and shared. As a result, the propagation of failure is minimized and the effect of being able to substitute functions in a limited way in another server instead of the server in which the failure occurred is obtained.

1 is a diagram illustrating a process of changing technology fusion trends according to the prior art.
2 is a block diagram of a block chain-based IoT network system according to an embodiment of the present invention.
3 is a configuration diagram of an IoT network system according to the prior art;
4 is a diagram illustrating a process of storing data in a blockchain-based Internet of Things network system according to an embodiment of the present invention.
5 is a flowchart illustrating a method of storing data in a blockchain-based Internet of Things network system according to an embodiment of the present invention.
6 is a schematic diagram illustrating a process of searching for data in a blockchain-based Internet of Things network system according to an embodiment of the present invention.
7 is a flowchart illustrating a method of querying data in a blockchain-based IoT network system according to an embodiment of the present invention.
8 is a diagram illustrating a process of inquiring a state of an IoT device in a blockchain-based IoT network system according to an embodiment of the present invention.

Hereinafter, specific details for the implementation of the present invention will be described according to the drawings.

In addition, in explaining the present invention, the same reference numerals are assigned to the same parts, and the repeated explanation thereof is omitted.

First, the configuration of a blockchain-based Internet of Things network system according to an embodiment of the present invention will be described with reference to FIG. 2 .

As shown in FIG. 2, the blockchain-based Internet of Things network system according to an embodiment of the present invention includes an IoT device 10, a network server 20 that collects data from the IoT device 10, and a cloud that stores the data. It is composed of a storage 50 and a blockchain network 70 with each network server 20 as a node 70.

First, the IoT device 10 is a typical IoT device, and is a device that generates or collects data and transmits it to the network server 20 . Preferably, it is an IoT device according to the LPWA (Low Power Wide Area) standard. As an example, the IoT device 20 is a small electronic device such as a mouse that communicates data according to the LPWA standard, a wearable device such as a watch, a healthcare device, and the like.

In addition, a plurality of IoT devices 10 configure the IoT network 30 around one network server 20. In addition, the IoT network 30 is formed according to the LPWA standard. In addition, the network server 20 receives and collects data produced or collected by each device from each IoT device 10 .

In addition, there are a plurality of network servers 20, and each network server 20 forms one IoT network 30. In addition, the plurality of IoT networks 30 are configured as open distributed networks. That is, the network server 20 may be connected to and communicate with at least one other network server.

Meanwhile, each network server 20 participates as one blockchain node 60 in the blockchain network 70. That is, each network server 20 is connected to the blockchain network 70 as one blockchain node 60. In addition, each network server 20 is connected to at least two or more other network servers.

In addition, each network server 20 has its own blockchain ledger (not shown) in order to serve as a blockchain node 60. The blockchain ledger organizes and holds blocks that record data transactions (or data transactions), such as data policies such as access rights or data inquiry/storage, in chains. That is, each network server 20 copies and stores the ledger (or blockchain ledger) of data policy/transaction information. Therefore, all network servers 20 synchronize with each other as blockchain nodes 60 and have the same blockchain ledger.

Specifically, one block records data policy/transaction information. In particular, a hash value of each data policy/transaction information is obtained and the hash values are configured as a block chain. At this time, the blockchain ledger includes both the blockchain composed of hash values of each data policy/transaction information as a chain of blocks and the data policy/transaction information itself. By browsing the data policy/transaction information (or block) of the blockchain ledger, the contents of the block or data policy/transaction can be viewed, and the authenticity of the information can be verified by authenticating the hash value of the blockchain.

In particular, when each network server 20 collects and stores data from the IoT device 10 or retrieves data, it organizes data-related information such as data storage address, data access authority, and storage/inquiry transaction information into blocks to obtain its own data. It is added to the blockchain ledger, and the added block information is transmitted (propagated) to other network servers (20). The added information or block is added as a blockchain to the existing blockchain ledger.

In addition, other network servers receive block information added from the previously updated network server 20 and add the block information to their own blockchain ledger. Preferably, the network server 20 transmits update information (additional information) on the added block chain to network servers located in its vicinity, and the network servers in the vicinity transmit update information on the block chain to themselves. It is recorded in the blockchain ledger and transmitted to clients around it again. Therefore, all network servers 20 located in the blockchain network 70 synchronize the blockchain ledger and all have the same blockchain ledger.

Meanwhile, the network server 20 can access the blockchain network 70 by accessing its own blockchain ledger. That is, by inquiring the blockchain ledger or updating by adding a block to the blockchain ledger, accessing the blockchain network 70 to query the blockchain or add a block to the blockchain to update.

Here, the data-related information includes data policies such as storage addresses and access rights, and data transaction information, and data transaction information refers to information about data storage or retrieval (save/retrieval time, storage/retrieval subject, etc.).

Meanwhile, each network server 20 stores data collected from its own IoT network 30 (IoT device belonging to the IoT network) in the cloud storage 50.

Preferably, the cloud storage 50 is configured based on a network composed of all network servers 20 . Each network server 20 participates as a server node storing data in the cloud storage 50 . That is, the cloud storage 50 is formed as one virtual storage space, and data storage or inquiry is performed on the virtual storage space, but actual data is mapped to and stored in the network server 20 . In particular, the storage location of data is displayed as an address of a virtual storage space of the cloud storage 50 .

At this time, the cloud storage 50 is mapped and stored in the network server 20 in consideration of accessibility or stability, and may be stored in at least two or more network servers 20 .

Also, preferably, the mapping structure between the cloud storage 50 and the network server 20 is formed as a structure of a normal overlay network. That is, the cloud storage 50 configures one virtual storage network by configuring separate nodes and logical links based on the network of network servers 20 .

That is, in the blockchain cloud, data-related information is stored in blocks and the data is shared in a peer-to-peer manner whenever necessary, rather than sharing the entire data on the network through an overlay network.

Since related data is increasing with the development of sensors and technology in the IoT network 30, it is difficult to apply all data management to blockchain technology. Therefore, only data-related information is managed by blockchain, and data is stored in the network server 20. In particular, by virtualizing and managing the network servers 20 as cloud storage 50, only necessary data can be transmitted. Therefore, it is configured to have advantages through the blockchain by transmitting only the necessary data through the blockchain network through the blockchain cloud storage or the cloud storage stored in the existing server.

As described above, the blockchain-based IoT network system according to the present invention is a data transaction model of IoT based on blockchain, mitigating the imbalance problem of data collection and control and existing structural instability, and maximizing the use of IoT technology. can do. In this process, users can produce and sell data or purchase necessary data appropriately without building a separate IoT data infrastructure.

The existing method of collecting data in the IoT was to utilize a sensor network. However, this method of configuring the IoT network has a problem in that it has resource-limited limitations that users install and operate. Methods to increase the communication range in resource-constrained limits include using Zigbee, a multi-hop communication method, Wi-SUN, a next-generation low-power wireless communication standard, and LPWA, a low-power wide area network, a single-hop communication method. It can be classified as using Sigfox, LoRaWAN, etc., which are types of

In the present invention, in the LPWA IoT networks such as Sigfox and LoRaWAN, which are used as IoT-only network technologies, generally small data is transmitted to use a service that does not worry about data collision. In addition to this, when data is to be utilized in a densely populated area where various types of data are mixed on a large scale, QoS that can control and manage priorities based on the importance of services is required. Therefore, by applying the LPWA (dsLPWA) technology capable of prioritization management with a difference between services, the IoT network according to the present invention can manage large-scale and large-capacity data.

On the other hand, as shown in Figure 3, the IoT network according to the prior art configures the LPWA centralized IoT network. In contrast, the IoT network system according to the present invention constitutes an open distributed IoT network as shown in FIG. 2 .

In particular, the present invention configures a blockchain-based IoT network in the form of an open distributed IoT network. Therefore, the IoT system according to the present invention is an IoT network technology that alleviates the IoT problem, and can support autonomous data transactions through the smart transaction function of the block chain and the distributed ledger.

However, applying distributed ledger technology to IoT devices for data reliability through blockchain is not realistic considering devices with limited power supply, memory, and computing power. Therefore, the IoT system according to the present invention applies distributed ledger technology, which is a core technology of blockchain, to the IoT network itself without resource-limited limitations.

Next, a data storage method by a blockchain-based IoT network system according to an embodiment of the present invention will be described with reference to FIGS. 4 and 5. 4 and 5 are processes of storing data in a blockchain-applied LPWA IoT network.

As shown in FIGS. 4 and 5, first, data is transmitted from the IoT device 10 to the network server 20 (S11).

Next, the network server 20 accesses the blockchain network 70 for the received data and checks whether the corresponding data is acceptable (S12).

Next, in the blockchain network 70, the data policy and the storage address of the corresponding data are checked (S13). Here, the data policy is a policy on whether or not there is a storage right for the corresponding data. That is, check the data storage permission.

Next, when acceptance of the data is approved (S14), the network server 20 stores the received data in the cloud storage 50 (S15) and transmits the overlay to the overlay network (S16). That is, according to the overlay network structure (mapping structure between the virtual storage space and the actual storage space), actual data is transmitted to the network server 20 and stored therein.

Next, in the cloud storage 50, the stored block number (or the storage address of the corresponding data) is transmitted to the network server 20 (S17). And again, the network server 20 stores the transaction for the storage details in the blockchain network 70 (S18).

Next, a data inquiry method by a blockchain-based IoT network system according to an embodiment of the present invention will be described with reference to FIGS. 6 and 7. 6 and 7 are processes of querying data in a blockchain-applied LPWA IoT network.

As shown in FIGS. 6 and 7 , first, a service provider requests data inquiry from the network server 20 (S21).

Next, the network server 20 requests the blockchain network 70 to investigate the access authority of the corresponding data (S22). At this time, preferably, the network server 20 accesses the blockchain network 70 by inquiring its own blockchain ledger.

Next, the data policy such as the access right (inquiry right) of the data in the blockchain network 60 and the storage address of the data (or chain information, etc.) are checked (S23).

If access rights are checked and allowed (approved), the network server 20 receives approval (S24). And if approved, the network server 20 transmits chain information (or data storage address) of the data stored in the cloud to the cloud storage 50 (S25).

Next, the cloud storage 50 is searched using the chain information (or data storage address) (S26), and the searched data is transmitted to the network server 20 (S27).

Next, the network server 20 stores the transaction for the inquiry details in the blockchain network 70 (S28) and transmits the requested data to the provider (S29).

Next, a method for inquiring the state of an IoT device using a blockchain-based IoT network system according to an embodiment of the present invention will be described with reference to FIG. 8 . 8 is a device status request process of a blockchain-applied LPWA IoT network.

As shown in FIG. 8, first, a confirmation requester such as a provider requests a status inquiry of an IoT device to the network server 20 (①).

Next, the network server 20 requests the blockchain network 70 to investigate access rights for status confirmation data (②).

Next, policies such as access rights for status confirmation data are checked in the blockchain network 70 (③).

If access rights are checked and allowed (approved), the network server 20 receives approval (④). If approved, the network server 20 requests confirmation of the state of the IoT device 10 (⑤) and receives current state information from the IoT device 10 (⑥).

Next, the network server 20 stores the transaction for the status inquiry history in the blockchain network 70 (⑦), and transmits the requested status confirmation information to the confirmation requester (⑧).

Next, the effects of the blockchain-based IoT (Internet of Things) network according to the present invention will be described.

Markets such as IoT and sensors are recording high growth every year, and the IoT data produced is increasing exponentially. Therefore, as the capacity of the IoT network also increases, problems of cost and capacity arise. By introducing the decentralized structure of blockchain, secure communication between IoT devices existing at the end of the network and blockchain smart contract can be used to automatically execute tasks without central server management and to provide autonomous data transaction infrastructure. .

However, each part of the IoT architecture can act as a bottleneck or point of failure, resulting in instability that can disrupt the entire network. This also leaves them vulnerable to distributed denial-of-service attacks, hacking, data theft, and remote hijacking. Through blockchain transaction signing and verification, the validity of the IoT device can be verified, unstable nodes can be locked on their own without central management, and only message producers can transmit, enabling safe transmission between devices.

However, according to the prior art, an IoT network using LPWA (Low Power Wide Area) is a centralized management structure that manages servers that collect and send information collected from each sensor with a server database in the center. In such a centralized IoT network, it is difficult to share data, and when a failure occurs due to a cyber attack, software error, power supply, cooling, etc. in one part, unavailability of the entire service may occur.

In the case of blockchain, due to the distributed ledger, the same information is stored and operated in each node, and all nodes are connected. Therefore, if a block chain with an open distributed sharing structure is applied, flexible data sharing is possible in each node, and even if a failure occurs in one part, the propagation of failure is minimized due to distributed sharing of data, and the function is limited to other servers instead of the failed server. can also be substituted for

In addition, IoT networks suffer from vulnerabilities to data manipulation where data can be manipulated and used inappropriately. If a network is formed based on a block chain, data access is decentralized and data immutability is achieved through the distributed structure of the block chain. This allows malicious activity to be detected and prevented. Since each device is connected and interlocked, if the data of the device is manipulated, a violation occurs in the blockchain update, so the system rejects it.

In the above, the invention made by the present inventors has been specifically described according to examples, but the present invention is not limited to the examples, and various changes are possible without departing from the gist of the invention.

10: IoT device 20: network server
30: IoT network
50: cloud storage 60: blockchain node
70: blockchain network

Claims (13)

In the blockchain-based Internet of Things network system,
Multiple IoT networks composed of IoT devices and network servers;
cloud storage to store data; and,
A blockchain network comprising the network server as a blockchain node;
The network server stores data collected from IoT devices belonging to its own IoT network in the cloud storage, and records storage addresses, data policies, and data transaction information for the data in the blockchain network,
The cloud storage is formed in an overlay network structure based on a network composed of the network servers,
The IoT network is composed of a plurality of IoT devices and one network server,
The system,
(a1) transmitting data from the IoT device to a network server of an IoT network to which it belongs;
(a2) the network server accessing the blockchain network and requesting whether or not to allow storage of corresponding data;
(a3) checking the data policy of the right to store the corresponding data in the blockchain network;
(a4) storing the corresponding data in the cloud storage in the network server if the storage of the corresponding data is approved;
(a5) transmitting and storing corresponding data to the network server according to the overlay network structure;
(a6) transmitting the storage address of corresponding data to the network server in the cloud storage;
(a7) storing the transaction for the storage of corresponding data in the blockchain network in the network server;
(b1) receiving, by the network server, a request for data inquiry;
(b2) requesting, by the network server, an investigation into the right to search for the corresponding data to the blockchain network;
(b3) in the blockchain network, checking the inquiry authority of the corresponding data and the storage address of the corresponding data;
(b4) transmitting, in the network server, a storage address of the corresponding data to the cloud storage when the inquiry of the corresponding data is approved;
(b5) retrieving the corresponding data using the storage address of the corresponding data in the cloud storage;
(b6) transmitting the searched data from the cloud storage to the network server;
(b7) storing the transaction for inquiry details in the blockchain network in the network server; and,
(b8) A blockchain-based IoT network system characterized by performing a method including the step of returning data requested from the network server to a provider.
delete According to claim 1,
The network server has its own blockchain ledger to serve as a blockchain node, and the blockchain ledger organizes and holds blocks in which data storage addresses, data policies, and data transactions are recorded as a chain, and the blockchain ledger A blockchain-based Internet of Things network system characterized by holding in synchronization with other network servers.
According to claim 3,
When the network server collects and stores data from the IoT device or retrieves data, the data storage address, data access authority, and storage/retrieval transaction information are configured as blocks and added to its own blockchain ledger, and the added block information Blockchain-based Internet of Things network system, characterized in that for propagating to other network servers.
According to claim 3,
The network server can access the blockchain network by accessing its own blockchain ledger, and accesses the blockchain network by querying its own blockchain ledger or updating by adding a block to its own blockchain ledger. A block chain-based Internet of Things network system characterized by updating by querying or adding a block to the block chain.
delete delete delete According to claim 1,
The IoT network is a blockchain-based Internet of Things network system, characterized in that mutual communication by LPWA (Low Power Wide Area) standard.
delete delete delete delete

Images